They live in pairs now, all 5 minutes away from each other:
Chan and I.N
Lee Know and Han
Changbin and Hyunjin
Felix and Seungmin
They used to live 2 dorms of 4 each, and of course all together before that.
What Han said about being healthier is really noticeable even from a fan perspective. In last year's "One Kid's Room" ep for Han, the others described it as Han "lost his light", and even at one point disappeared for a full day where no one knew where he was or could contact him. There's a lot of content out there, on stage and off, where you can notice Han being much quieter and less involved, a real 180 from his usual personality. The other members really looked after him and picked up a lot of the playful, loud energy for him.
I believed it happened around 5-Star Era? So if you watch a variety of stuff from that time, you'll probably notice it sometimes.